Hand-operated plugger.



C. H. HART.

HAND OPBBATBD PLUGGEB.

APPLIOATION FILED MAY 1o, 1905.

Patented Nov. 1'7, 1908,

ff/44.4% l l run- NoRRls Pzrzus 60 WASHINGTON. n. c.

CHARLES H. HART, OF HARTFORD, OONNlU'lltlU'l.

HAND-OPERATED PLUGGER.

Specification of Letters Patent.

Application led May l0, 1905.

Patented Nov. l', 1908.

Serial No. 259,662.

To all whom it 'may concern:

Be .it known that I, CIL-xmlns H. Haar, a citizen of the United States,and a resident of Hartford, in the county of Hartford and State ofConnecticut, have invented and produced a new Hand-Operated Plugger, ofwhich the following is a specification.

My invention relates to the class of hand tools in which a blow isobtained from a spring or the like which is placed under tension andthen released in the operation of the tool -to exert a force upon ahammer or like part.

The object of my invention is to provide a device of this class which,while being effectual for the purpose intended, may be constructed ofsmall dimensions as compared with like tools of the prior art, and alsoto provide a device which shall have extreme ease and freedom ofmovement of the parts and consequently of operation.

011e form of device in the use of which these objects may be attained isillustrated in the accompanying drawings, in which- Figure l is a viewin central, longitudinal section of a dental plugger embodying myinvention. Fig. 2 is -a detail view in crossseetion through the pluggershown in l? ig. l on dotted line a-b.

In the accompanying drawings, referring to Fig. l, the numeral l denotesthe casing or shell to and within which the other parts of the deviceare secured and located. A tip 2 is secured to the shell at one end, asb v means of interengaging screw threads, and a tip 3 is also secured,in a similar manner. to the opposite end of the shell. This shell has atone end a slot -t preferably cut through each wall of the shell ondialnetu rically opposite sides; it will be understood, however, that asingle slot cut through one wall only may be employed. spindle 5 extendsthrough and has lengthwise sliding movement within the shell, projectingout at each end, and provided with means for attachment of the tools 6.This spindle is longitudinally grooved, as shown at 7, for the receptionof a spline, which may be in the form of a screw 8 projecting throughthe tip 3 into the groove and preventing the spindle from rotarymovement. This spindle contains a slot or recess 9, preferably extendingthrough the spindle on a diametrical line. W'ithin this spindle a leveris located, this lever being pivoted to the spindle as at l0.

This lever is provided with a shoulder 'forin- .iug a pawl ll, and thelever is also provided with a cam l2. fr hammer l' is litted to slidewithin the casing or shell l, this hammer being tubular to receive thespindle 5. and the lever ll as to a Vlarge part thereof is locatedwithin the hammer, the pawl ll eugaging a lip 'tst on the inner surfaceof the hammer. spring l5 forces the lever with the pawl ll intoengagement with the lip let. The tip 3 has an inwardly projecting sleevelo, the inner end of which is located in position to engage the cam l2of the lever and thus swing it on its pivot as the spindle 5 is movedlengthwise.

- A main spring '17 is located within the casing, one end of thespring'resting against the hammer 18 and the other end of the springresting against the wings 1S extending laterally from an adjusting' nut1S). These wings extend through the slots -iland engage the innerthreaded surface of an adjusting' sleeve 20 mounted on the outer surfaceof the casing l. the ends of the sleeve abutting against a `shoulder onVthe casing and a shoulder on the tip 23, which shoulders hold thesleeve against lengthwise movement.

A spring 2l rests with one end against a shoulder 22 on the spindle, theopposite end resting against a collar 23. This collar is secured betweenthe end of the tip 2 and a shoulder on the inner surface of the casingl. The opening in the collar 52?) is sutliciently large to permit theanvil 2lon the spindle to move therethrough and project beyond the innerend thereof to receive the blow of the hammer.

In the operation of the device pressure being exerted as by a push orpull upon the tool G, the spindle is moved endwise within the casing.The pawl ll. engaging the lip 'let on the hammer 13, moves the latterwith the spindle, placing a tension upon the spring t7. As the pawl Vismoved within the sleeve lo the inner end engaging the cam l2 forces thepawl from engagement with the lip -t and the hammer being thus freed isforced by the spring 17 downward striking against a shoulder on thespindle, this shoulder' forming an anvil 2l to receive the blow, which.of course, is imparted directly to the tool It will be seen from theabove construction that the lever bearing the pawl and 'the disengagingcam being located within the llO hammer a very compact device may beproduced. The lever being pivoted at one end, and the cam being locatedat the opposite end, with the pawl between the two points a constructionis provided wherebjT but little throw of the lever is provided todisengage the parts, and this throw is procured owing to the extremeleverage, with but the exertion of a little power.

T{Vhat I claim as my invention and desire to secure by Letters Patent isl. A casing, a spindle slidably mounted therein and with an endprojecting therefrom and having an anvil, a hammer mounted toreciprocate on said spindle and having an inwardly projecting lip, atrip lever pivoted at one end in a recess in the spindle, said leverhaving a cam and a pawl the latter located to engage said lip, means forforcing the hammer against said anvil, means to engage the cam at theouter end of the lever to release it from engagement with the lip, and

means for returning the spindle to its normal position.

2. A casing, a spindle mounted to slide within the casing and with anend projecting therefrom and having an anvil, a tubular hammer locatedWithin the shell and having a lip, a spring for forcing the hammeragainst said anvil, a sleeve secured to the shell and projecting inwardfrom the end thereof within said spring and forming a support therefor,a lever pivoted within a recess in the spindlel and within said hammerand with its opposite end projecting out of the end of the hammer andwithin said sleeve and having a pawl to engage a lip on the hammer and acam at its end to engage said sleeve, and means for returning thespindle to its normal position.

CHARLES H. HART.

W'itnesses ARTHUR B. JENKINS, ALBERT B. HART.

